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Table 3 Spearman correlation matrix of ambient, personal air pollutants and heat indexa

From: Associations between microvascular function and short-term exposure to traffic-related air pollution and particulate matter oxidative potential

  BC CO NOx PM2.5 O3 Heat Index (F°)
24h averages of ambient exposures
BC (μg/m3)   0.87 0.90 0.33 −0.69 −0.27
CO (ppm)    0.90 0.27 −0.73 −0.32
NOx (ppb)     0.20 −0.77 −0.32
PM2.5 (μg/m3)      −0.06 0.09
O3 (ppb)       0.54
7-day averages of personal exposureb
Personal NOx (ppb) 0.47 0.45 0.47 0.16 −0.43 −0.25
  1. aPollutants are mean-centered by region
  2. bCorrelations for personal NOx were calculated with 7-day average of ambient pollutants and heat index